Margin stop-setting mechanism for typewriters



A ril 19, 1949. c. w. BRUMHILL 2,457,382

MARGIN STOP-SETTING MECHANISM FOR TYPEWRITERS Filed Feb. 15, 1945 2 Sheets-Sheet 1 April 19, 1949..

C. W. BRUMHILL MARGIN STOP-SETTING MECHANISM FOR TYPEWRITERS Filed Feb. 15, 1946 lllioo Ill |||90|||||||9|0|1| 2 Sheets-Sheet 2 Paten Ap 19, 1949 v 1 2,467,882

UNITED STATES PATENT OFFICE MARGIN STOP-SETTING MECHANISM FOR TYPEWRITERS Claude Wellington Brumhill, Leicester, England, assignor to The Imperial Typewriter Company Limited, Leicester, England Application February 15, 1946, Serial No. 647,929 In Great Britain March 8, 1945 1y Claim. (Cl. 197-453) In typewriting and like machines, the travel Figure 6 is a cross section therethrough lookof the carriage is determined by margin stops ing to the right; which in general require to be adjustable to vary Figure 7 is a cross section looking to the left; the width of typing or to determine the width of and margin. The object of the present invention is Figure Sis a plan. thereof. an efficient mechanism whereby these stops may The carriage is mounted on a slide It movbe set employing only one hand of the user of the able endwise on ball bearings in guides one of machine. which. is indicated at H; it comprises the usual With this object in view the invention proend plates I2 between which the platen I3 is vides in or for a typewriting machine of the 10' mounted in known manner. This carriage is kind in which the traverse of the carriage is den m l y c pled to an es pement (not shown) termined by adjustable margin stops on its 00- by means of a toothed rack bar I 4 carried by leoperating with a centre stop on the frame and vers H5 at each end that are movable about an in which the carriage is connected to an escapeaxis [5 to raise the rod and thereby to d1sconment, a carriage having the combination of a heat itfrom the escapement. Each lever l6 toothed stop rod extending longitudinally in the carries a thumb piece I! by which it may be decarriage and having the margin stops mounted D e edrod latch mechanism associated with each cal construction, are carried by a toothed, horimanual cont10l on the carriage, including a de-- stirrup 22 transfixed by s op rod is and biased tent and latch mechanism controlling member upwards by spring 23 so that the lower bar 22' of extending longitudinally in the carriage, moveach leg enters between the teeth; the legs are able in one direction to disconnect the carriage 30 connected by a cross bar 24 which retains the from the escapement to permit free traverse, to stirrup release the detents from the stop rod, and to ren- In order simultaneously to depress the stirder the latch mechanism operative to permit it to rups 22, so as to disengage them from the teeth engage the frame-mounted member upon travand to' free the stops l8a, [8b, from rod l9, a

erse of the carriage and thereby to look a mar- 3 margin stop release bar 25 extends above them gin stop temporarily in a central position so that and is carried by levers 26 pivoted on the end the carriage may be adjusted in relation to said frames l2 at 21. The right hand lever 23 is constop, and movable in the reverse direction to connected by a bridge 28 to a margin stop setting m'sm inoperative and to connect the detents so 4 by which it may be depressed to lower release that the adjusted margin stop is connected to the bar 25 so that the latter presses on the tops of stop rod in its adjusted. position. the stirrups 22 and frees the margin stops I512, The foregoing and other features of the in- 18b from the margin stop rod I 9. It is an imvention set out in the appended claims are in-corportant feature of the invention that this moveporated in the cairiage which will now be dement also disconnects the escapement by raising scribed as an example with reference to the acthe rack bar I4: for this purpose the rack recompanyin drawings in whichlease lever l6 carries a lug 3| which is engaged Figure 1 is a side elevation of the carriage; by the thumb piece 30 of the margin stop set- Figure 2 is a front elevation of relevant porting lever 29 as the latter is depressed. It will tions thereof; be seen from Figs. 2 and 4, however, that the Figure 3 is a section through the carriage; thumb piece IT projects sufficiently beyond the Figure 4 is a plan of one end of the carriage; thumb piece 30 to permit the rack release to be Figure 5 is a longitudinal section through the operated independently of the margin stop releft hand margin stop shown in Fig. 2 but on a lease. larger scale; When the margin stops l8a, l8b have thus been released they are frictionally held, against inadvertent movement by the pressure of release bar 25 (which is to be identified with the detent and latch mechanism controlling member hereinbefore referred to) and by the resilient pressure of the bodies of the stops on the upper surface of rod l9. Simultaneously, latch mechanism is rendered operative, i. e., is placed in condition to operate. This mechanism comprises a latch tongue 32a or 32b on each stirrup which is thereby lowered to operative position in which it is placed to engage, upon such traverse of the carriage as will bring either margin stop towards the centre 33 of a spring bolt 34 carried centrally by the guide I I and provided with spring 34 (Figure 2).

The operation of margin stop setting is therefore as follows. The depression of thumb piece 30 disconnects the carriage from the escapement, releases the stops l8a, i8b from the stop rod I9, and makes ready the latch tongues 32a, and 3%. If the carriage be now traversed to the right, the left hand tongue 3% engages the bolt 34 so that the left hand stop I82) is temporarily locked in a central may then be moved in either direction to bring said stop into the required position along the carriage. The thumb piece 30 is then released, locking the stops l8a, lBb to the stop rod. l9 (stop 18b in its adjusted position), releasing the left hand tongue 321) from bolt 34, and locking the carriage to the escapement, margin stop release lever 29 being raised by spring 35 and rack release lever l6 being moved by any suitable spring (not shown). The carriage may then be traversed to the left to bring the left hand stop 1817 out of register with the bolt 34, and the operations repeated in respect of the right hand stop We. It will be obvious that these operathe use of one hand (the right hand) for the carriage to be traversed by that hand, grasping any convenient portion thereof, while the thumb of that hand is employed to manipulate the thumb piece 30.

For convenience in setting the stops, riage has a visible scale 36 and indicators 31a, 31b on the stops l8a, l8b which project up behind the paper shelf 38 to co-operate with said scale. On Fig. 1 the double line 39' indicates the wall of a carriage and cover 39, Fig. 4, the side whereof is cut away to disclose the parts which it normally covers.

It has already been mentioned that the two margin stops in, IBD are substantially identical. Apart from being right and left hand, their difierences reside in the slight offset given to the left tongue 32a on the right hand stop I80. from the stirrup leg 22' (as clearly shown in Fig. 2) whereas the tongue 32b on the other stop 18b is aligned with its stirrup leg (as shown in Figs. 2 and 8), and in the provision of the spacer or distance piece 40 projecting from stop |8b towards stop l8a. A function of this Spacer is to prevent the indicators 31a, 31b fouling one 'another.

the car-- subsequent stop, inthe recess -stop for engaging The invention is applicable to a detachable carriage i. e., one which is removable from the machine complete with the guides H.

I claim:

For a typewriting machine of the kind in which the traverse of the carriage is determined by adjustable margin stops on the carriage cooperating With a center stop on the frame and in which connected to an escapement, a carriage having the combination of a toothed stop rod extending longitudinally in the carriage and having margin stops mounted thereon, a releasable detent movably mounted on each margin the teeth of the stop rod to to the rod, which detent is constituted by a U-shaped member having its legs transfixed by the stop rod and each affording a cross bar to engage among the stop rod teeth, spring means urging said U-shaped member to a tooth-engaging position on the margin stop, latch mechanism associated with each margin stop which mechanism is capable of being rendered operative prior to such traverse of the carriage as will bring a margin stop to the center stop and which thereupon engages a framemounted member to lock said margin stop temporarily in the central position, which latch mechanism comprises a latch member on the U- shaped member and movable with the latter, and a common manual control on the carriage, including a detent and latch mechanism controlling member extending longitudinally in the carriage, movable in one direction to disconnect the carriage from the escapement to permit free traverse, and to engage and move the U-shaped members and thereby to release the detents from the stop rod and to render the latch mechanism operative to permit the latter to engage the frame-mounted member upon traverse of the carriage and thereby to look a margin stop tema central position so that the carriage may be ad usted in relation to said stop, and direction to connect the escapement, to render the latch mechanism inoperative and to free the U-shaped members for movement by their spring means into engagement with the teeth of the stop rod whereby the adjusted margin stop is connected to the stop rod in its adjusted position.

CLAUDE WELLINGTON BRUMHILL.

lock the stop REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

